Pears are cool fruits. It is sweet, slightly sour and cool. It enters both the lung meridian and the stomach meridian, and has the effects of promoting fluid production, moistening dryness, clearing heat and resolving phlegm. It can be used for treating dysphoria and thirst caused by fever, damage of body fluid and insufficient body fluid. It can also be used for cough due to heat, expectoration, yellow and sticky phlegm, palpitation and madness caused by phlegm heat. Avocado can be used for treating constipation, expelling wind, relieving asthma, cough and allergic urticaria, and has the function of clearing away heat. Pears are cold and sour. Usually the species are deciduous trees or shrubs, and a few species are evergreen.